Automatic drilling or tapping machine



Aug. 7, 1928. 1,619,530

A. M. JOHNSON APTOMATIC DRILLING OR TAPPING- MACHINE ,Filed March s, 1925 4 Sheets-Shet 1 d/lezf 0 225 972 Aug. 7, 1928. 1,679,530

A. M. JQHNSON' 7 AUTOMATIC DRILLING QR TAPPING MACHINE Fil-ed March 8, 1923 4 Sheets-Sheet 2 Aug. 7, A. M. JOHNSON AUTOMATIC DRILLING TAPPING MACHINE Fi led. March 8, 1923 V 4 Sheets-Shet 3 7? 7/ 86 i \l I 6 J lllll/l/LU Alig. 7,1928. A. M. JOHNSON AUTOMATIC DRILLING OR TAPPiNG MACHINE Filed. March 8, 1923 4 Sheets-Sheet 4 Patented Aug. 7,1928."

I UNITED' STATES PATENT orries.

ALBERT M. aonnson, on ROCKFORD, ILLINOIS, AssIeNoR'ToB R-NEs nRILL'oo, OF

I nocxronn, ILLINOIs, A ooRroRATIoNorI LINoIs'. I r

AUTOMATIC DRILLING on TAPVPINGIMACHINE.

' Application filed March 923. seriaino. 623,63

The invention relates to machine tools and has especial reference to an automatic drilling or tapping machine. i i

The primary object of the invention is to produce a machine tool of the character indicated which operates automatically and at high speed to per-form thread cutting, drilling or similar operations in or upon relatively small parts'whic-h are presented to the cutting tool or tools in rapid succession,the

aim being to increase the productive capacity of machines ofthis character,-effecting a sub stant1al saving in time and labor, and consequently enabling the performance of such means for effecting" the movement of the tool spindle, which is operable to cause the descent of the spindle initially at high speed and finally as the tool is'fed into engagementwith the work, at a slower or Working speed. I

Still another obj'ectof the invention is to provide a spindle control mechanism embodying spring means for effecting a prac-' tically instant return of the'spindle to its initial or uppermost position.

A further 'ob'ect is to rovide a construo tion enabling the external's'crewthreading of the work to a predetermined extentunder the control of the threading tool. a

The objects of the invention thus generally stated, together with ancillary advantages, are attained by the construction and arrangement illustrated in the accompanying (lra ings. While I have illustrated one embodiment only of the invention, it is contemplated that various changes maybe made by those skilled in the artwithout departing from the spirit and scope of the invention as expressed in the appendedlclaims.

In the specific embodiment of the invention herein shown, the tool spindle rotates constantly 1n one direction, and the meanseffected automatically after the completion of the screW-threading'or other-operation releasmgthe spmolle to theaction of spring means for restoring it to its initial position.

In a copending application, Serial N o. 623,-

631 filing date Mar. 8, 1923 I have illustrated, described and claimed a form of the invention in which the direct-ionof rotation of the spindle is reversed and inwhich the,

1neans for effecting the longitudinal movements of the spindle is at all times operatively associated With and actuated by the drivingm'eans. Y i i Figure l of the drawings is'a fragmentary side elevational View of a 'machine embodymg my invention and equipped for cutting external screw threads..- Fig. 2 is a fragnentary plan view of the rear end of the machine with a' portion of the enclosing. housing removed. Fig. 3 ma fragmentary sectional View taken approximately in the plane of line 3 of Fig.2. Fig. 4.18 a frag-f ment-ary vertical sectional view taken-in the plane of line 4 4: of Fig. 2. Fig. 5 is a-similar View takenapproximately in the plane of line 5-5 of Fig. 2. Fig. 6 is an underside view of the turntable for presenting the Work to the cutting'tool, illustrating the means for 'operatingthe table. -Fig. 7 is a fragmentary side elevational view of a portion of the spindle control mechanism, the turntable beingshown in section. Fig. 8 is'ja fragmentary front View illustrating a portion of the spindle control mechanism shown in" Fig. 7 and also illustrating the gearing connection between theicross shaft and the main spindle. Fig. 9 is a fragmentary horizontal sectiona l view taken approximately in thc'plane of line 9-9 of Fig. 7.

The machine tool selected for purposesof illustration comprises a column 10 extended forwardly at its upper end as at 11 to form a bearing or head 12 in which is mounted a sleeve 13 for up and down sliding but nonrotary movement. Within the sleeve is journalled a tool spindle 14. A'collar 15 fast upon the spindle bears upon the upperv end of the sleeve, and interposed between. the lowerend of the sleeve and the spindle is a ball thrust bearing 16.

Extending rearwardly from the column 10 and supported partially thereby and by a standard 17 is a housing or case 18 2) in which; is mounted a drive shaft 19 opera tively connected by mitergears 20 and 21 The shatts and are inclined upwardly and {or *ardly she vnclezuriy n'rhig. l

and are enclosed by a suitable casing 26 which extends iorwardlyito enclose also the gears 2 l25.

The articles constituting the work are presented with. a step-by-step movement to the operation of the cutting. tool-herein a selfopening die designated by the numeral and this worlt-prez-ient-ing means include; a turret or turntable siutabty mounted upon a stationary i i-nine 29 which in turn i" can ried by. a table 30 superposed upona chip pan 31, the whole being carried by a support column 10,

32 nounted ior verticaiadjustment upon the i i frame 29 upon the table encloses 'i'neans l or advancing the wcrl' to present it to the cutting tool, vi ch means is actuated in thereciprocation ola barSZl connected by a link ot and acrank arm 8% 1 of th with the main control inecha machine to be pre ently descrioed.

rte'l erringr to Figs. 1 to 5 the drive shaft- 19,1110L111t6tll1] bearings and S6 rising from the bottom. oi? the caseiS is connected n 1 1 by means ot a pinion 37 :ras thereon, and

a spur gear 38, with a toothed elen'ient or head 39. The gear 1 1;; upon a sl 4.0 mounted in shearing. a l on an X allel to the slnrtt 19' end the stud is journalled in the sleeve 40 end in present instance is made rigid with. a

one end to receive a m. as hv 4-8 apertured at p 44- rigidly secured to the dru of screw 4:5. fhiid sha. v crank a "in ti l at its tree end and is is suitably supported in t-he'case l8 1 irom the bottom thereof. It will he observed that relative rotation is permitted let-ween the sleeve 10 and the drum i3.

Means isprovidech.however, for establishing an operative connection between the sleeve and the drum through the head 39, and this means in the present i: stance comprise: a series oi ratchet tecthet? and incmher 48 carried by the drum adzq'ited to enwith the teeth 4:7. This member 46 pivoted at 4.9 in a diannztr cal slot 50 pro vided inthe drum and cons .itutes dog; new mally actuated by a coinpressi n spring); 51

for effecting a positive driving connection between'the slee and drum. fiiaid spring 51 is entered. in a suitable socket 52 in the drunrand its free end engages the dog 8.

The 'l reeend the dog projects a substantial distance be ond. the periphery oi the drum s3, and mounted upon opposite sides of the drum are a pair of stop pii s 53 and 5st one 01? which at al times positioned in the path oi movement oi the free end of the dog 0 when the latter is rotated with the drum Said pins 53 and are carried in arms 5 and 56 respectively, i1 which is slidaole in a bearing bracket 58 formed integral with and rising from the bearing 41. For this purpose the bracket is provided with suitable hearing sleeves 5- and 60, and aiso hasa pair of forwardly tending arms 61 each [having a bearing sleeve 62 in which. the stop pins 53, are respectively slidable. irs shown in Fig. 2, the dog i8 has its free endbeveled upon its side adjacent the teeth in order readily to engage therewith and also to form a. cam suriace which is adaptedto coact with the stop pins pins are provided with beveled ta-ces complei'nentary to the beveled faces oi the dog i8 and serve as cam members adapted in the movement of the dog as aforesaid to efi'ect the disengagement oi the dog from the teeth i? whereby toeiiect the stoppageoi the drum 4:3. 7

The pins 53, are arranged to be moved alternately under the control'oi' the spindle i l into tlie path oi? movement of the. dog 48 by means to be presently described, for the purpose of effecting the intermittent rotation oi the druu'i and a pair of cams 63'and 62: fast upon the shaft l ijhe cams 63 and 64 are adapted to effect the downward movement of the spindlel'irst ata relatively high speed and then at a low or working speed.

(v kl th free end if a lever 66 "fast upon a rock snatt 6? which is suitably mounted in a hr clcet 68 carriec by the housing 26 at the.

lower rear end thereof; Upon said. rock shaft 67 is made rigid a gear segment 69 meshing with a spur pinion '50 which latter is jmn'nalled upon 72 also carried by the bracket Rigid with the pinion T0 is a sprocket gear 3 connccted by chain 74 (Figs. 1 and 7) with a sprocket wheel 75 mounted to travel upon the threaded e d 76 ot a cross reed shaft 77.

.1111 adjustable stop T8 having a boss 'Zilis (laptod i'o'r engagement by a lug 80 on the nor-LU the shaft 7? is rotated in a reverse diupon a rod 57 53, 5st. Preterabl aism these stop stud shaft '71 in abearing The arrangement is such that- To this end the cam 63 operatively en s with a roller 65 upon (1,1 ILL) mechanism.

rection and causes the sprocket wheel to move away from the stop 78.

Fast upon the shaft 77 s a spur pinion 81 (Fig. which meshes with a rack 82 formed inte ral with the sleeve 13 u 3011 the 'worin 100 to mesh properly with the'worni who rear side thereof. The arrangement is such that in this operation of the cam 63, the

spindle is initially moved downwardly at a relatively high speed, and then due to a dwell. 03 in the cam the downward desgent of the spindle ceases iiiomentarily while the other cam 04: comes into operation to effeet a continuation of the downward descent of the spindle but at a slow or workingspecd. This latter cam (31 is arranged to operate upon a roller 83 mounted in a .shoe 8 1 (l d) which is mounted upon the cam shaft 14 for relative transverse sliding iiioveinentas permitted by slots formed in opposite sides of theshoe. Rigid with the shoe and extenc'ling upwardly and forwardlv therefrom is a rod 86 entered through the lower end of the housing :20 and eine'rg,

lever 87 in turn is. operatively connected to a bracket 89 pivoted upon a shaft 90.

Vfithin the housingQG is mounted a worm gear 91 meshing with a worm 92 fast upon the driven shaft 23 of the change speed Also mounted on the shaft rigid therewith is a spur gear 93 which is connected by a gear train 94, 95 and 96 with a horizontal shaft 97 connected by bevelgearing 98 with a vertical shaft 99. The

latter has at its lower end a wori'iil 100* will be seen that the bracket may be swung that the return of the spindle is thus eifected through. its connection with the lever 87' to carry the worm 100 into and out of mesh with tie worm wheel 101, the cam 64 being adapted to move the rod 86 and with it the free end of the lovers? downwardly to ef feet the desired iiiterengagen'ient of the \101111100 with the worm wheel 101. Norn-ially the worm 100 is held, out of mesh with 10 1 of the lb't-ol 8'7 and'operates through a v the worm shaft 102 (Figs. 1 and 8). The gears 94:,'

plunger 105 against an abutment 106 on the bracket. it will be apparent that this spring 1.101, the 1' at; are saved. from injury. The shaft 102 upon which the worm gear 101inountedis operatively connettcd with the cross ed shaft 7'? through a' reduction g'fi ig' 1 8) to effect the desired slow ng' feedoit'the spindle. This reducworm tion gearing comprises in the present in stance a pinion 10'? fast upon'the shaft 102 and meshing with an internal gear 108 formed within a housing member 109 fast upon the shaft 77.

It will be seen that to effect the first or initial downward movement of the spindle, the cam 63 operates to rotate the sprocket 75 threaded upon the shaft 7.7. movement of thespindle does not commence, however, until the sprocket in its travel on screw-threaded portion of the shaft inter-engages with the adjustable stop 78. Thus the position of the stop on the shaft determines the extent of the movementof the spindle'by the cam 63 A momentary cessation in the downward movement of the spindle occurs after suchinitial movement,

1 di e to a dwell in the cam 63, and at this time the cam 6 1 comes into operation to swing 100 into mesh with the worm Thus in. the final or downward moven'ient of the spindle the shaft 77 is 1'0- tated from the cnain speed mechanism through gearing 919--1, etc., and the reduc tiongearing 107108.

Upon the completion of the operation of wneel 101.

the cam 0%, the spindle is released for up ward movement, returning to its initial position through the operation of a coiled compression spring 110 encircl ng theaupperend of the spindle and bearing between a "clamp nut 111 and the gear 25 operating in the upper end of the forwardly extended por' ti on of the housing 26. It will be apparent almost instantly upon its being released by the operation of thecam 64.

Such release-by the cam 6 1, however, is

under the control of the spindle in its clownward inoven'ient, the arrangement being such that when the spindle approaches a predetermined point in its" downward travel, that is to say, when a thread of a predetermined length hi s been cut by the tool 27, the cam the spindle; On the other hand, the return of the spindle to its initial position is ar-- is set in motion to effect the release of Such initial to the stop 78 a pair of stops 112 and 113 between which travels a nut 114, the stops and nut being provided with interengageablebosses 112, 113 and 114. The nut is operatively connected, through an arm 115 and a link 116 (Fig. 7), with the rod 57 which operates the stop pins 53 and 54 of the main control mechanism. The lowermost position to which the spindle may travel may be predetermined by adjusting the stop 112 in accordance with the length of the thread to be cut or the depth of the hole to be drilled. When such position is reached, the nut 114 will engage with the stop 112, and the resulting rotation of the nut will move the rod 116 upwardly and forwardly to disengage the dog 48 from the stop pin 53, releasing the dog for engagement with the teeth 47 of the head 39. In the ensuing rotation of the head, the cam shaft 44 is rotated, and in such movement of the cam shaft the cam 64 moves free of the roller 83 allowing the spring 103 to effect. the disengagement of the worm 100 iirom the worm wheel 101.

The spindle now travels upwardly, and through the operation of the cross. feed shaft 77 turns the sprocket 75 to restore the lever 66 to its initial position (Fig. 4). As the spindle approaches its uppermost position, the nut 114 engages with the stop 113, moving the rod 57 downwardly and rearwardly to move the stop pin 54 out of the path of movement of the dog 48. It will be observed that upon the disengagement of the cam 64 from the roller 83, the shaft 44 rotates approximately. through 180 degrees to position the cam 63 for almost instant engagement with the lever 66. Hence upon the return of the spindle to its uppermost position the cam 63 operates immediately to start the spindle downwardly under high speed, and the operation of the cam 64 follows to continue the descent of the spindle at working feed.

I have shown a means whereby the operation ofthe nut 114 in the downward movement of the spindle, instead of occurring as a result of its travel into engagement with the stop 112, is effected by the operation of the self-opening die 27. Thus a lever 117 is pivoted at 118 upon a suitable bracket 119 so as to swing in a horizontal plane with one end lying adjacent the periphery of the lower end of the self-opening die 27. In this die is mounted a plurality of thread cut ting devices or chasers which are arranged to move outwardly so as to project from the periphery of the die upon the opening thereof. Said lever 117 is connected by means of a bell crank 121 also pivoted upon. the brackct 119 with a rod 122, the latter being pivoted at its upper end to an arm 123 rigid with the nut 114. The latter, it will be remembered, is connected with the operating rod 57 of the control mechanism so that operation of the cam 64 to interrupt the working feed and release the spindle ccurs instantly upon the completion of the i desired tln'caihcutting or other operation...

The self-opening die 27 may be of any suitable character. That herein shown is of a well-known type comprising generally an outer cam sleeve 124 operatively associated on the one hand with the chasers 120 and on the other hand with a trip member 125 adapted to engage with the work, when a predetermined length of thread has been cut to impart movement to the cam sleeve 124 whereby to effectthe movement of the chasers into position to engage the lever 117. 126 (Fig. 1) designates a stationary bracket having a roller 127 vertically adjustable therein and adapted to be engaged by the cam sleeve 124 as the spindle approaches its uppermost position whereby the sleeve is operated in a direction to restore the chasers 126 to their operative or cutting position,

The means for operating the turntable or turret and for ejecting the work therefrom may be of any suitable character such, for example, as that shown and described in my copending application Serial No. 623,631, above referred to. V

The operating means comprises (Fig. 6)

a band 128 encircling a depending portion 129 of the turntable, with a one-way clutch formed by recesses 130 and rollers 131 interposed therebetween. An arm 132 rigid with the band 128 is connected through a pair of spaced stop members 133 and 134 with the arm 33. 135 deslgnates a locking mechanism for the turntable operativelv associated with the bar 33 by a lever 136. The arrangement is such that as the bar 33 moves forwardly the plunger 135 is first withdrawn and the turntable then rotated a distance equal to the distance between the axes of pieces of work a mounted upon the turntable. As the bar moves in the opposite direction, the plunger 135 operates to lock the turntable against movement while the band 128 moves into position for the next stroke.

137 indicates an ejector lever pivoted on a horizontal axis and carrying at its free end an e ector pm 138. This lever 137 has a sliding connection with the lever 136 so that in the swinging movements of the latter the pin 138 is moved vertically. The pin is arranged to operate an ejector head 138 mounted coaXially of the work holder 139.

It will be seen that I have produced a ma chine tool capable of operating at high speed with a high degree of efliciency. The tool spindle is moved to carrythe tool into engagement with the work through the opera:

tion of the cams 63 and 64 much more rapidly than is possible with the gear feeds of the prior art; and the return of the spindle to its initial position by the spring -means which I have provided, is practically instantaneous. Obviously, therefore, theproductive capacity of the machine is very high; also, notwithstanding the rapid operation of the machine, the thread cutting or otherwork to be done is performed with a high degree of precision.

I wish especially to point out that while the invention has been described more particularly with reference to a machine for cutting screw threads, it is capable of use for performing other operations as well.

I claim as my invention:

1. In a machine tool, the combination with a reeiprocatory spindle,'0f a rotary element having a gearing connection .with the spindle and two separate ea m means operable' to eifect rotation of said element, a follower associated with one of said cam means and having a connection with said element to rotate it at high speed, a second element constantly driven and normally'disconnected from the'first element, the other cam means being operable to effect a driving relation between the second element and the first element substantially upon the eomple tion of the operation of the first cam means.

2. Inv a machine tool, theeombination with a reciprocatory spindle, of driving means operable to rotate thesplndle constantly in one direction, a rotary element having an op erative connection with said spindle to move spindle, said feed shaft havine; a driving gear thereon, means wperatively connected with a source of power and including a gear element movable into and out of operative association with said driving gear, and intermittently operating means/to effect successively the rotation of said feed shaftat one speed and the engagementof said gear element witn the drivine' ear to rotate theh t feed shaft at another speed.

41. In a machine tool, the cembmation ofa spindle, a feed shaft having a driving; an

gagement with the spindle to move longitudinally, means including a ca1n operating to rotate said feed shaftwhereby to move the spindle initially at highspeed, and cam controlled means for continuing the move ment of the spindle at slow or working feed,

the first cam during the final portion of its eluding a constantly rotating d'riv operation being effective to move the spindle while the secondcam starts functioning.

5. A machine of the character'deseribed comprising, in combination, a spindle, feed mechanismfor the spindle including a rotary element in driving relation thereto, power driven means for effecting the rotation of said element including a constantly rotating driver, a. member arranged for'poslitive connection wit-h the driver and having an operative connection with said feedelement to move it, and a device operable "to effect such connection of the driven member with the driver and adapted to automatically interrupt such connection upon the completion of afpredetermined range of move ment of the driven member by the driver.

6. A machine of the character described comprising, in'combination, a spindle, feed mechanism for the spindle including a rotary element in driving relationthereto, power driven means for effecting the rotation of said elementincluding a constantly rotating driver, a cam member arranged fol-positive connection with the'driver, means actuated by said cam member to rotate said feed ele ment, and a device operable to eifect such connection of the driven member with the driver and adaptedto automatically interrupt such. connection upon thecompletion of a predetermined range of movement of the driven member by the driver, said device heing'operatively associated with the spindle so as to be'actuat-ed thereby as the spindle approaches a predetermined'point in its travel. 7 v i r l 7. In a machine tool, the combination of a reciprocatory spindle, a drive shaft, a

:driven shaft, said drive shaft being connected with the spindle to rotate it, and means for moving the spindle longitudinally including a reduction gearing having a, direct connection at all times with the drive shaft and a disengageable connection with the spindle, and cammeans actuated from the driven shaft-and adapted to effect a conneetion between the reduction gearing and the spindle. I

8. A machine of the character described,

having a spindle and a normally disengaged feed mechanism therefor, power driven means for engaging the feed mechanisn'i in '1, a mem berarranged for positive connection withthe driver and operatively associated with the feed mechanism, and a device operable to effect such connection ofthe driven member with the driver and adapted to automatically interrupt such connection .when the feed mechanism has become engaged.

9. A machine tool having a'longitudinally movable spindle, means for moving the spindle longitudinally including a gear mounted on a fixed aXis,"apivoted bracket having a gear thereon movable into and out-of mesh with the f first mentioned gear, spring means tending ,tomove said bracket in one direction, to hold said gears out, of mesh, and cam means for moving the bracket inthe opposite direction ,to effect the intermcshing of the gears said cam means being operable to release the bracket; to the action of the spring means at apredetermined point in the movement-ofthe spindle. v

10. In a machine tool, the combination of a spindle, and means "for moving the spindle longitudinally including a gear operatively connected with a source of power, a bracket upon which-saidgear lSdIlOllIltQCl, and means also connectedwvith the source ;of power for swinging said bracket including a lever and a spring interposed betweensaid lever and said bracket. p I 1 11. In-a machine tool, the combination of a spindle, and means for moving the spindle longitudinally including i a gear, operati-vely conneoted with a source of ;power, a bracket upon which said gear is n'1ounted, means for swinging said-bracket including a lever and a spring interposed between said lever and said bracket, and ncans also'connected with the sourceof power for swingingthe lever whereby totaotuate said spring tocause it to swing the bracket. I

112. A machine-tool having a reciprocatory spindle, a constantly driven shaft, a .pivoted bracket having a gear element operativelyconnected'w-ith said shaft, afeed shaft having a gearing connection with the spindle and having a gear element with which the first :gear element is adapted to mesh, and cam means initially acting *directly to rotate: the feed shaft and then swingingsaid bracket to'eifect the -interengagement ofsaid gear elements. l l

13. In a machine-tool, the combination of a spindle, a shaft having a gearing-conned tion with the spindle to move it-longitudinally, and means for rotating said shaft including a gear element, a member rigid with said gear element, acamengaging said member for actuating said gear element, and means including feed, gearing providing an operative connection between said gear element and said shaft.

'14. In a machine tool, the combination of a spindle, a shaft having a gearing connection with the spindle to moveit longitudinally,-and means for rotating said shaft including two intermeshing gear elements, a cam for actuating one of said gear elements, and achain and sprocket connection between the other one of said gear-elements and said shaft. 7

15. In a, machine tool, the combination o'fa spindle, and means for moving the spindle longitudinally including a shaft having a gearing connection therewith,andalso a. threaded portion, gear element mounted on the threaded portion of the shaft, a step the independent rotary movement'ofthe se'c- 0nd member upon. the first member whereby to vary the extent of movement of the spindle. I p a 17. In a machine tool, the combination of a spindle, means for moving the spindle longitudinally including a cam, and means providing an adjustable lost motion connectionbetween theca'm and the spindle whereby to vary the extentof movem'entof the latter. r V

18. In a machine tool, the combination of a spindle, feed mechanism for the spindle including a feed shaft operatively connected with the spindle, and means for actuating said feed mechanism comprising a driven shaft, a cam on said shaft, means providing an operative connection "between said Cain and said feed shaft,'a drive shaft-,and'means under the control of the spindle for effecting a positive driving connection between the driven shaft and the drive shaft.

19. In a machine tool, the 'combination of a spindle, feed mechanism for the spindle, including a screw-threaded shaft, a nut mounted to travel on said shaft in the movements 'thereof,stop means on the shaft adapted to limit the travel of the nut, a drive shaft, means for moving the spindle longitudinally including a cam 'operatively associated with said feed mechanism, and means arranged to be actuated by said nut and adapted to effect a rotation of said cam by the drive shaft. I 20. In a machine tool, the combination of a spindle, means for moving the spindle longitudinally including a shaft having a gearing connection with the spindle, means for directly rotating the shaft to effect its rapid movement, a gear element operatively connected with a source of power, reduction gearing, associated with said shaft, and means for moving said gear element into and out of operative relation relative to said reduction gearin 21., A machine tool having, in combination, a tool spindle mounted for reciproca tory movements, a feed shaft connected with the spindle to move it longitudinally, a gear element having a driving connection with the shaft,a second gear element operatively associated with the first gear element, constantly rotating drive element, a cam having disengageable connection with the drive element and adapted to actuate said second lot ice

a spindle, means for moving said spindle longitudinally including a cam having a l o lower with a driving connection with the spindle, a constantly rotating element having a disengageable connection With said cam,

and means controlledby the movements of SfllCl' spindle for intermittently connecting anddisconnecting said (121111 and said con stantly rotating e lement."

23.111 a machine tool, the combination} with a part to be moved in one direction, of a cam, a follower torthe cam having a driving connection. with said part to move it in the operation'ot' the cam, a constantly rotating eleinent,-and means controlledby the movement of said part'to ei'iect the posi tive connection and disconnection or said cam to and from said element at predeten mined points in'the ope cam.

52%. a pair of cams, a follower for oneof said cams having a driving connection connected with a part to be moved, and means confnected with a .source'ot power and constitnting an additional means for, moving said part, the other cam being adapted to control the operation of said additional means.

25. In a machine tool, the combination of aconstant'iy rotating element, a shaft'having a pair of cams thereon, a lollowerl'or one of said cams havinga driving connection connected with a part to be moved, means connected with a source of power and con stitiiting an additional"means for moving said part, the otheifcam being'adapted to control the operation of said additional means, and means controlled bythe move 'ating cycle of said ments of said part for effectin the inter" mittent rotation of said cam shai't.

2G.'A"mach ne tool having, in coinbina tion, a reciprocatory spindle and two sepa-' rate means foreti'ecting the longitudinal movement'ot' the spindle, one oi said means. including a cam havinga follower with av driving connectionwith the spindle, and the other means including a feed mechanism and a second cam controllingthe same, said cams being successively operable so that upon the completion of the movement of the spindle by the, operation of one cam, the continned movement of the, spindle is effected bythe operation oftheother cam.

27. In a machinetool, the combinationo f V association. with said element. W p v The" combination with a spindle, as

Mi, tending to move the spindle in one direction, and means fOIInOV- ing the-spindle in the opposite direction including a member having a pair of cams a s 3i1idle, spr n means- In a machine tool, the combination ofaram rigid therewith, constantly rotating ele-' ment, and means controlled by the; movements of the spindle in opposite directions for ei'iecting a positive driving connection" betwee said 'meinber'and said element.

- 28. in a machine tool, the combination of a spindle, means tending toinovefthespiir' die in one direction, and'means for moving the spindle in the opposite direction includ ing a member having a pair 0icams rig-id therewith and driving means for the member having a disengageable but positive connection therewith, and means controlled by the i'n'oveinents of the spindle for interrupting the operation'ol saidImeinber by said drivmg means. 7 V I s 295111? ii'i'aeliine tool, the combination of a spindle, spring IDQiiiSIGilCllIlg to move the spindle in one direction, cam means for movin the spindle in the opposite direction," F drivii gnieans having a positive but d sengageable 'connectionwvith said cammeans,

and means controlled by the movements of the spindle for governing the operation of said cam means by said driving means.

30. machine tool, the combination of a longitudinally movable spindle, a con- Si'zii'ltly driven element, 'a shafthaving' cam means operativeiy associated with'the spindle toinove it, means providing a connection between the cam shaft and said constantly rotating element including a driving dog,

a stop pin movable into and out of the path of movement oit-said dog and adapted to move it out of operative association with said element, andmeans controlled by the spindle forcontrolling the position ot said stoppin.

31, In a machine tool, the combination of a longitudinally movable spindle, a ,con-- stantly driven element, a member having cam means thereon, a drivingdog operative; ly associated with said element: and; said mei'nber whereby the latter may be driven. by the forms astop-pin adapted for engagemont'by s id dog to eiil'eot the movement of the latter into inoperative position,

' means operatively connected with the spindle for moving said step pin to release the dog, and'means operatively associated with said cam meansitorvimparting movement to the spindle. I V I 32;. lhecombination of a spindle'inounted forlongitiidinal movement, means including I pei'a'tively connected with'the spin dleto move it, afconstantly driven element,

means including a driving 'dogfor effecting a connection between said element and'said cam, and means controll d by the movenients oi the spindle ior elii'eetingth'e movement ct said dog intofiand out of operative driving means. a cam a follower for said cam h aving a driving relation with the spindie to move it, means operatively connected with the driving means to move the spindle, asecondcam tor controlling the last mentioned means, and means controlled by the movements or the spindle for rotating the earns, the arrangement being such that the first mentioned cam operates to eti'ect the initial rapid movement of the spindle and .the'means controlled by the second cam opcam includingradriving dog arranged for operative engagement with said driven element, a stop pin arranged for engagement by said dog and adapted to govern the position of the latter, and means for controlling the position otythe stop pin in accordance with the position of the spindle.

35. In a machine tool, the combination with a spindle and a tool carried thereby having a cutter adapted to move radially when disengaged from the work; of means for imparting moven'ient to the'spindleincluding a constantly rotating element, a second element operatively connected with the spindle, and means controlled by the radial movement of said cutter for controlling the connection between said elements, said means including a' driving dog between said ele inents, a stop pin adapted to be engaged by said dog, and a part disposed in the path of movement of said cutter in the inoperative pos tion thereof to controlthe position of sai d, stop pin.

36. In a machine toolv having a spindle, a

cutting tool carried by the spindle, having radially movable cutters, of means for feeding the spindle and cutting tool to the work,

and means oaerableb the ClISGD H 'QHXGDiT of the cutter from the work to interrupt the feeding oi? the spindle.

37. In an automatic thread cutting machine, the combinationof a tool spindle, and a tool carried thereby having a cutter movable radially upon the completion of a predetermined thread cutting operation, of means for feeding the spindle and tool to the work, and means controlled by the disengagement of said cutter to interrupt the operation of the spindle feeding means.

38. In a machine tool, the combination of a spindle, means for moving the spindle in one direction comprising a rotary part having a gearing connection with the spindle and a cam having atollower with a driving connection wlth sa d part, a constantly rotatmg drive element having a disengageable connection with said cam, and means opera-' tive in the movement of the spindle to con nect and disconnect said element and said cam.

39. Ina machine tool,- the combination of a spindle mounted for longitudinal movements, a spring tending tov move thespindle in one direction, mains for moving the spin.-

die in the opposite direction including a i cam, a constantly rotating drive element having a discngageable connection. with said cam, and means operableby a; movement of the spindle by said spring to, 'elie'ct a connection between said cam and said drive element.

4-0. In a machine tool, the combination Ofii a spindle mounted for lonj itudEnal movements, teed mechanism tor the spindle to move it in one direction, and means for con- 7 trolling the operation of the spindle bysaid feed. mechanism including a cam, a con-- stantly rotating drive element, and means actuated upon a predetermined movement of the spindle whereby to effect a connection between said earn and said element and thereby render said ,iieed mechanism oper able. p I

ll. In a machine tool, the combination of a part mounted for reciprocation, feed mechanism for said part, means for driving said feed mechanism and havlng a disengageable connection therewith, spring means normally holding the driving means inmoperative relation to the feed mechanism, and means under the control of: said part to effect a connection between said feed mechanism and its driving means.

42. In a machine tool, the combination. oi a part mounted iior reciprocation, teed mechanism for said part, means for driving said feed mechanisn'i and having a disenga'geable connection therewith, spring means i movement of said part to'disconnect said cam from its drive element.

43. In a machine tool, the combination ot a spindle mounted for longitudinal move ments, a constantly rotating drive element, a shaft having apair of cams thereon, means associated with one of said cams to move the spindle in one direction at an initial high speed, means associated with the other cam ,adaptedto continue the movement of the spindlebut at a low speed, spring means for moving the spindle in the opposite di: rection, and means operable in the movement of the spindle by said spring means to effect a driving connection between said drive element and the cam shaft.

44. In a machine too1,the combination of a part mounted for reciprocation, feed mechv anism for said part, driving means, cam means for establishing an-operativeconnection between said driving means and said feed mechanism, spring means tending to maintain the driving ine'ans disconnected from the feed mechanism, and means for operating said cam means intermittently for efl'ecting a connection between the fee mechanism and its driving means.

45. Amachine tool having, in combination, a tool spindle mounted for reciprocatory movementsya feed shaft having a gearing connection with the spindle to move it lonfeed shaft.-

In testimony whereof, I have hereunto aflixed my signature. e e

- ALBERT M. JOHNSON. 

